WAC 296-104-235   Construction -- What are the requirements for code exempted boiler and unfired pressure vessel safety relief valves?  The boilers and unfired pressure vessels covered by WAC 296-104-230 shall be protected by the installation of ASME Code relief valves with trial levers, set pressure not to exceed the boiler's or the unfired pressure vessel's design pressure. Relief valves shall be installed on top of the boiler or the unfired pressure vessel or on outlet piping as close as possible to the boiler or unfired pressure vessel, with a minimum of fittings and no valves intervening. The outlet of the relief valve shall be run full size to a safe place and shall not induce stress on the valve.



[Statutory Authority: RCW 70.79.030, 70.79.040 and chapter 70.79 RCW. 00-21-024, § 296-104-235, filed 10/10/00, effective 11/13/00. Statutory Authority: RCW 70.79.030 and 70.79.040. 96-21-081, § 296-104-235, filed 10/16/96, effective 11/16/96. Statutory Authority: RCW 70.79.030. 78-03-057 (Order 78-3), § 296-104-235, filed 2/22/78; Part IV, § 8, filed 3/23/60.]